|
 |
Circuits designed by David Johnson, P.E.
Last Updated on:
Friday, March 23, 2012 06:13 AM
Master Category List
- Dave's Circuits
The contents & graphics
of Discovercircuits.com are copyright protected.
LINKING to Dave's circuits is permitted but DO NOT COPY any files to your WEB
SITE server |
|
|
|
|
More
Flasher/Blinker Circuits
LED Circuits |
|
Ultra Low Current
3v LED Flasher #3 --
February 26, 2011 |
This
circuit takes advantage of a tiny LMC7215 low current draw voltage comparator from
National Semiconductor and a super efficient green LED from King Bright. The 3v
powered circuit forms a classic pulse generator circuit, which drives the LED.
The pulse width is set at about 20ms, the pulse rate is about 0.5Hz and the peak LED
current is only 100ua.
|
|
|
|
This means the average LED current is only 1ua. The overall current draw
from the 3v supply is only about 2ua. This circuit might be handy to include in a
flashlight, to it can be located in the dark. The current draw is so low that the
circuit can be powered by a tiny battery for years.
|
|
|
Click
on Drawing Below to view PDF version of Schematic |
|
 |
|
|
|
|
